1use poulpy_hal::{
  2    api::{FillUniform, Reset},
  3    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
  4    source::Source,
  5};
  6use std::fmt;
  7
  8use crate::layouts::{GLWECiphertext, Infos};
  9
 10#[derive(PartialEq, Eq, Clone)]
 11pub struct GGSWCiphertext<D: Data> {
 12    pub(crate) data: MatZnx<D>,
 13    pub(crate) basek: usize,
 14    pub(crate) k: usize,
 15    pub(crate) digits: usize,
 16}
 17
 18impl<D: DataRef> fmt::Debug for GGSWCiphertext<D> {
 19    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 20        write!(f, "{}", self.data)
 21    }
 22}
 23
 24impl<D: DataRef> fmt::Display for GGSWCiphertext<D> {
 25    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 26        write!(
 27            f,
 28            "(GGSWCiphertext: basek={} k={} digits={}) {}",
 29            self.basek, self.k, self.digits, self.data
 30        )
 31    }
 32}
 33
 34impl<D: DataMut> Reset for GGSWCiphertext<D> {
 35    fn reset(&mut self) {
 36        self.data.reset();
 37        self.basek = 0;
 38        self.k = 0;
 39        self.digits = 0;
 40    }
 41}
 42
 43impl<D: DataMut> FillUniform for GGSWCiphertext<D> {
 44    fn fill_uniform(&mut self, source: &mut Source) {
 45        self.data.fill_uniform(source);
 46    }
 47}
 48
 49impl<D: DataRef> GGSWCiphertext<D> {
 50    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
 51        GLWECiphertext {
 52            data: self.data.at(row, col),
 53            basek: self.basek,
 54            k: self.k,
 55        }
 56    }
 57}
 58
 59impl<D: DataMut> GGSWCiphertext<D> {
 60    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
 61        GLWECiphertext {
 62            data: self.data.at_mut(row, col),
 63            basek: self.basek,
 64            k: self.k,
 65        }
 66    }
 67}
 68
 69impl GGSWCiphertext<Vec<u8>> {
 70    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
 71        let size: usize = k.div_ceil(basek);
 72        debug_assert!(digits > 0, "invalid ggsw: `digits` == 0");
 73
 74        debug_assert!(
 75            size > digits,
 76            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
 77            size,
 78            digits
 79        );
 80
 81        assert!(
 82            rows * digits <= size,
 83            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
 84            rows,
 85            digits,
 86            size
 87        );
 88
 89        Self {
 90            data: MatZnx::alloc(n, rows, rank + 1, rank + 1, k.div_ceil(basek)),
 91            basek,
 92            k,
 93            digits,
 94        }
 95    }
 96
 97    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
 98        let size: usize = k.div_ceil(basek);
 99        debug_assert!(
100            size > digits,
101            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
102            size,
103            digits
104        );
105
106        assert!(
107            rows * digits <= size,
108            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
109            rows,
110            digits,
111            size
112        );
113
114        MatZnx::alloc_bytes(n, rows, rank + 1, rank + 1, size)
115    }
116}
117
118impl<D: Data> Infos for GGSWCiphertext<D> {
119    type Inner = MatZnx<D>;
120
121    fn inner(&self) -> &Self::Inner {
122        &self.data
123    }
124
125    fn basek(&self) -> usize {
126        self.basek
127    }
128
129    fn k(&self) -> usize {
130        self.k
131    }
132}
133
134impl<D: Data> GGSWCiphertext<D> {
135    pub fn rank(&self) -> usize {
136        self.data.cols_out() - 1
137    }
138
139    pub fn digits(&self) -> usize {
140        self.digits
141    }
142}
143
144use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
145
146impl<D: DataMut> ReaderFrom for GGSWCiphertext<D> {
147    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
148        self.k = reader.read_u64::<LittleEndian>()? as usize;
149        self.basek = reader.read_u64::<LittleEndian>()? as usize;
150        self.digits = reader.read_u64::<LittleEndian>()? as usize;
151        self.data.read_from(reader)
152    }
153}
154
155impl<D: DataRef> WriterTo for GGSWCiphertext<D> {
156    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
157        writer.write_u64::<LittleEndian>(self.k as u64)?;
158        writer.write_u64::<LittleEndian>(self.basek as u64)?;
159        writer.write_u64::<LittleEndian>(self.digits as u64)?;
160        self.data.write_to(writer)
161    }
162}